I needed a photo of Soaptree Yucca booms for my flora guide sequel so I was ecstatic to see them in full bloom this year! They prefer higher elevation so if you want to see them, head up to the Northeast Valley or check out the North State Trust land (on the North side of Dynamite) if you want to hike. Remember to get a permit, though. You can apply online and have it mailed to you for just $15.
Here’s a preview of the page: Soaptree Yucca (Yucca elata)